Integration tests can be found under ./integration. There are a variety of helper functions that can be used in your integration tests that can be found under ./support. Mock data for the integration tests is under ./fixtures.
All of the created support functions can be chained off of cypress, for example:
cy.get('input[name=someInput]').selectByLabel('Label Name')
A fixture can be used as such to access some mock data, for example:
import users from '../fixtures/users.json'